Roughly 2 gallons of fresh snow (The rule around my house has always been that the snow must be at least 5-6 inches deep, preferably from a single storm. Scrape the top inch off the snow on the ground, then gather the underlying 3 inches or so until you have enough, LOTS is needed.)

Mix sugar and all liquid ingredients. (By hand until sugar is mostly dissolved.)
Put about 1/2 the snow in a large container.
Cut in 1/2 of milk mixture.
Add more snow.
Cut in the rest of milk mixture.
Add snow until saturated. (There shouldn’t be much left.)

Mix lightly until all snow is cream colored and “wet”. (Don’t overmix)

Enjoy!

(p.s. It helps to have a glass of cold water nearby to ward off the ‘Brain Freeze’ that comes from eating too much, too fast.)